Table 2. Covariation of development traits for the subset of passerines included in this study.

Pearson correlation coefficients:
Variables	Mass Growth rate (d-1)	Tarsus Growth rate (d1)	Nestling period (d)	Incubation period (d)
Mass growth rate (d-1)		n = 49	n = 92	n = 92
		0.65	-0.31	-0.39
		P < 0.001	P = 0.003	P < 0.001
Tarsus growth rate (d1)			n = 49	n = 49
			-0.55	-0.77
			P < 0.001	P < 0.001
Nestling period (d)				n = 148
				0.51
				P < 0.001